I can use kilner jars for jam right?

[HannahHack]

I have just got a complete mind blank about this. I am going fruit picking tomorrow and have normal jam jars and a few kilner jars with rubber seals. Can I use them for jam making? If so, where do I put the cling film/plastic seal bits you put over the top? Or is the rubber seal enough?

[CogitoErgoSometimes]

Pop the waxed disc on top of the jam and they should be fine. But check the contents occasionally. I once had a lot of preserved lemons go mouldy in a Kilner jar.

[Taffeta]

I make marmalade every year and store it mostly in Kilner jars. I never bother with wax discs and have yet to open a mouldy jar.